linux-kernel - Re: [PATCH 0/4] KVM: x86: Emulator

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Date:   Wed, 25 May 2022 18:48:59 -0700 (PDT)
From:   Robert Dinse <nanook@...imo.com>
To:     Sean Christopherson <seanjc@...gle.com>
cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 0/4] KVM: x86: Emulator _regs fixes and cleanups


      This set of patches did allow 5.18 to compile without errors using gcc 
12.1.  Thank you!

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On Wed, 25 May 2022, Sean Christopherson wrote:

> Date: Wed, 25 May 2022 22:26:00 +0000
> From: Sean Christopherson <seanjc@...gle.com>
> To: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Sean Christopherson <seanjc@...gle.com>,
>     Vitaly Kuznetsov <vkuznets@...hat.com>,
>     Wanpeng Li <wanpengli@...cent.com>, Jim Mattson <jmattson@...gle.com>,
>     Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
>     linux-kernel@...r.kernel.org, Robert Dinse <nanook@...imo.com>,
>     Kees Cook <keescook@...omium.org>
> Subject: [PATCH 0/4] KVM: x86: Emulator _regs fixes and cleanups
> 
> Clean up and harden the use of the x86_emulate_ctxt._regs, which is
> surrounded by a fair bit of magic.  This series was prompted by bug reports
> by Kees and Robert where GCC-12 flags an out-of-bounds _regs access.  I'm
> 99% certain GCC-12 is wrong and is generating a false positive, but just in
> case...
>
> I didn't tag patch 2 with Fixes or Cc: stable@; if it turns out to "fix"
> the GCC-12 compilation error, it's probably worth sending to v5.18 stable
> tree (KVM hasn't changed, but the warning=>error was "introdued in v5.18
> by commit e6148767825c ("Makefile: Enable -Warray-bounds")).
>
> Sean Christopherson (4):
>  KVM: x86: Grab regs_dirty in local 'unsigned long'
>  KVM: x86: Harden _regs accesses to guard against buggy input
>  KVM: x86: Omit VCPU_REGS_RIP from emulator's _regs array
>  KVM: x86: Use 16-bit fields to track dirty/valid emulator GPRs
>
> arch/x86/kvm/emulate.c     | 14 ++++++++++++--
> arch/x86/kvm/kvm_emulate.h | 14 +++++++++++---
> 2 files changed, 23 insertions(+), 5 deletions(-)
>
>
> base-commit: 90bde5bea810d766e7046bf5884f2ccf76dd78e9
> -- 
> 2.36.1.124.g0e6072fb45-goog
>